The tonsils are one of the most important human immune organs. They are the first to meet disease-causing mechanisms in the environment and provide protection for our body. The tonsils contain special fissures - lacunae - a trap for germs and viruses, as well as a kind of "testing ground" where the immune system learns to fight germs and viruses. Chronic tonsillitis is a common disease of the body, when an inveterate inflammatory process is localized in the tonsils. In the case of a decrease in general immunity or a powerful infection (for example, tonsillitis) enters the body, a large amount of pus accumulates in the lacunae, consisting of dead microbes, white blood cells(the so-called plugs). The unpleasant thing about chronic tonsillitis is that it can support and contribute to the progression of other diseases, ranging from frequent colds and sinusitis, to allergic diseases, rheumatism (a dangerous disease that affects the heart and joints) and glomerulonephritis (kidney disease). The tonsils cease to function as an immune organ, immunity decreases, and the least provocation (hypothermia, fatigue, stress) leads to illness. Carrying out preventive courses with KSD once every six months will preserve the tonsils.